<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <!--警告区域 -->
      <el-alert
        show-icon
        title="注意:只允许为第三级分类设置相关参数!"
        type="warning"
        :closable="false"
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            :options="cateList"
            v-model="selectKeys"
            :props="cateProps"
            @change="cateChange"
          >
          </el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 渲染tag标签 -->
                <el-tag
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  closable
                  @close="tagClose(scope.row, index)"
                  >{{ item }}</el-tag
                >
                <!-- 动态编辑tag标签-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column label="#" type="index"> </el-table-column>
            <el-table-column
              prop="attr_name"
              label="参数名称"
            ></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="deleteParam(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 渲染tag标签 -->
                <el-tag
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  closable
                  @close="tagClose(scope.row, index)"
                  >{{ item }}</el-tag
                >
                <!-- 动态编辑tag标签-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column label="#" type="index"> </el-table-column>
            <el-table-column
              prop="attr_name"
              label="参数名称"
            ></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="deleteParam(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="this.movetitle + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <div>
        <el-form
          ref="formRef"
          :rules="formRules"
          :model="paramForm"
          label-width="80px"
        >
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="paramForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
      </div>
      <div slot="footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addAndEditParams">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cateList: [],
      //级联选择框双向绑定到的数组
      selectKeys: [],
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      //被激活的页签的名称
      activeName: 'many',
      movetitle: '添加',
      manyTableData: [],
      onlyTableData: [],
      addDialogVisible: false,
      paramForm: {
        attr_id: null,
        attr_name: ''
      },
      //控制按钮与文本框的切换显示
      inputVisible: false,
      inputValue: '',
      formRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created() {
    this.getCateList()
  },
  computed: {
    //如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectKeys.length !== 3) {
        return true
      }
      return false
    },
    //当前选中的三级分类的Id
    cateId() {
      if (this.selectKeys.length === 3) {
        return this.selectKeys[2]
      }
      return null

    },
    titleText() {
      if (this.activeName === "many") {
        return '动态参数'
      }
      return '静态参数'
    }
  },
  methods: {
    //   获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败')
      }
      this.cateList = res.data
      //   console.log(this.cateList);

    },
    //级联选择框变化，触发函数
    cateChange() {

      //证明选中的是三级分类
      // console.log(this.selectKeys);
      this.getParamsData()

    },
    //Tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    //获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectKeys.length !== 3) {
        this.selectKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      //分割字符串
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        //控制文本框的显示与隐藏
        item.inputVisible = false
        //文本框中输入的值
        item.inputValue = ''
      });
      console.log(res.data);
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    //显示编辑对话框
    async showEditDialog(attrId) {
      this.movetitle = "编辑"
      const { data: res } = await
        this.$http.get(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        this.$message.error("获取参数信息失败！")
      }
      this.paramForm = res.data
      this.addDialogVisible = true
    },
    //添加和修改参数的对话框
    addAndEditParams() {
      this.$refs.formRef.validate(async valid => {
        if (!valid) return
        if (!this.paramForm.attr_id) {
          const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,
            { attr_name: this.paramForm.attr_name, attr_sel: this.activeName })
          if (res.meta.status !== 201) {
            return this.$message.error("添加参数失败！")
          }
          this.$message.success("添加参数成功！")
        } else {
          const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.paramForm.attr_id}`,
            { attr_name: this.paramForm.attr_name, attr_sel: this.activeName })
          if (res.meta.status !== 200) {
            return this.$message.error("更新参数失败！")
          }
          this.$message.success("更新参数成功！")
        }

        this.addDialogVisible = false
        this.getParamsData()
      })
    },

    //参数表单关闭时，清空检验 
    addDialogClosed() {
      this.$refs.formRef.resetFields()
      this.paramForm = {}
      setTimeout(() => {
        this.movetitle = "添加"
      }, 200);
    },
    //删除参数的事件
    deleteParam(attrId) {
      this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(async () => {
        const { data: res } = await
          this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
        if (res.meta.status !== 200) {
          return this.$message.error('删除参数失败！')
        }
        this.$message({
          type: 'success',
          message: '删除参数成功!'
        })
        this.getParamsData()
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        })
      })
    },
    //文本框失去焦点,或者摁下Enter都会触发
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        //证明输入的内容，
        //需要做后续处理
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveProperty(row, "添加")
    },
    //添加或删除参数的属性
    async saveProperty(row, msg) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(',')
        })
      if (res.meta.status !== 200) {
        this.$message.error(msg + "属性失败！")
        row.attr_vals.pop()
        return
      }
      this.$message.success(msg + "属性成功！")

    },
    //标签关闭事件
    tagClose(row, index) {
      row.attr_vals.splice(index, 1)
      this.saveProperty(row, "删除")
    },
    // 按钮切换为文本框
    showInput(row) {
      row.inputVisible = true
      //让文本框自动获得焦点
      //$nextTick方法的作用，就是当页面上元素
      //被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });

    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 5px 10px;
}
.input-new-tag {
  width: 120px;
}
</style>